Okay, this has taken me WAY too long. Those of you who remember how my dolly was set up previously will notice some changes. I abandoned the dolly car that I built, and started over from scratch. The old one was too wobbly. I opted for using teflon sliding bearings in the DP fashion, and eliminated the rack gears in favor of a timing belt drive.
Currently I have it configured for the elusive "dolly zoom" shot that I've been wanting to do for years. Here's a few test videos to show you what I mean.
These shots are pretty much straight from the camera, meaning no motion tracking or anything:
This video I had to motion track the first two shots, because the ground was uneven:
The rig is using 3 stepper motors running from a 12v battery and controlled by arduino. The code was very generously written for this application by Dan Thompson.
Heres the rig in action. The reason it is so tall is to keep the track out of the frame. My goal was to make the car itself as compact as possible. If you look, the upper portion that is holding the camera and the vertical supports will unbolt when I'm not doing DZ shots. The car and gearbox together are only 5" long, 3" wide, and 5" tall. I did not intend for the 12v battery to ride along, but it happened to fit perfectly in that spot so I figured what the heck.
For all of the above shots, The dolly car travels 52", zoom from 28 to 70mm and the focus from 3.5' to 8'.
The timing belt enters and exits the box around these bearings, the blue parts are plastic spacers.
Top-down view of the gear box. The stepper is mounted to a pivoting plate, so that I can pivot the motor and worm shaft off the gears and slide the dolly freely. I was originally going to make it spring loaded, but that didn't work out so I just run a screw in place to hold the shaft in position.
Here's some closeups of the focus and zoom steppers, running the worm gears. The slots in the plate have teflon inserts to help guide the large gears.
My workmanship isn't the prettiest, but this is months worth of squeezing time out of my lunch breaks at work, so everything was a bit rushed. I also don't have access to CNC equipment so all parts were made on a manual mill and lathe.
so that is what you were shooting down on the waterfront - I was tempted to stroll on down there (when I saw the still you posted) as I work 9 blocks away. looks good - you should try that on the road that is under the hawthorne bridge on ramp (on the east side) - I had a buddy that shot there once with a video camera doing the same effect and it was mind blowing, of course adding time lapse is taking it to the next level - great job
Joined: Tue Aug 26, 2008 3:30 am Posts: 824 Location: Sydney, Australia
Re: Monorail Dolly Zoom
Alfred Hitchcock would be proud! Indeed you've nailed the 'Vertigo' effect.
Thu Apr 14, 2011 11:30 pm
Scorchio
Joined: Mon Nov 30, 2009 6:04 am Posts: 186 Location: Essex, UK
Re: Monorail Dolly Zoom
Excellent work! I love the effect. That system really opens up a ton of shooting possibilities.
How much would a setup like that cost to produce?
Fri Apr 15, 2011 4:17 am
Jim
Joined: Fri Jan 21, 2011 10:12 pm Posts: 196 Location: Amelia Island, Florida
Re: Monorail Dolly Zoom
I've watched both movies a dozen times. What my eyes are seeing doesn't compute with my brain. That's definitely a very interesting move. Like Matt said, Alfred would be proud
Joined: Sat Mar 06, 2010 7:14 pm Posts: 306 Location: Los Angeles
Re: Monorail Dolly Zoom
how did you manage to get the focus to zoom timing correct so the subject does not scale or move? excellent work and the rig looks great. love the gear setup
how did you manage to get the focus to zoom timing correct so the subject does not scale or move? excellent work and the rig looks great. love the gear setup
It's not perfect, in fact I decided that having the subject move just a little but is more interesting than it being totally still. Dan's code gave me a speed setting and a value for how many steps per motor. By trial and error, I figured out how far each motor needed to travel and at what speed for a given subject to lens distance. Then when I'm out in the field I just use a tape measure to set the distance, and I'm ready to go.
woohoohoo! loving it!!! have thought about vertigo timelapse shots for months, but it seemed simply out of reach..lots of reeeespect for your work others may think differently..for me the vertigo shot was the holy grail of timelapsing! congrats!!
Well I don't want to brag but it could possibly be the first time it's been done (timelapsed) in a controlled setting. Please correct me if I'm wrong. I still have a lot of work to do, the rig is a pain to use right now, and in it's current state I can't really use it as a regular dolly without a lot of work. I'm also pretty limited with the one lens, so finding shots suitable for it is kind of hard. I'd like to try a wider lens in the future.
Joined: Wed Nov 11, 2009 10:45 am Posts: 1685 Location: Merritt Island, Florida, Estates Unitas
Re: Monorail Dolly Zoom
I am in awe of your worm drive lens mover. Are you planning to produce these things to sell? I've had a direct drive version of a lens mover for a month or so. It uses a 1 RPM gearmotor which is faster than I would like. I'm waiting on some parts to arrive, then was going to make a worm drive version as well. Mine was going to use a factory made worm gearbox. Here's a link to the gearbox.
I'm curious about your worm drive. Do the big white gears on the lens have the teeth cut on a slight diagonal to mesh with the worm? Or will those worms mesh with a regular gear that has teeth perpendicular to the face of the gear? Where did you get the large worms and the large lens gears?
Here are some pictures of my direct drive lens movers. They can be configured for right or left hand drive by removing just one bolt. The big holes in the bracket slide onto a 15mm rail system like the JAG35 baseplate. I also used JAG35 D-gears as my lens gear. Placing individual lens movers on the rail system allows the spacing in between to be adjusted so they adapt to any lens. Three can be used to control zoom, focus and aperture.
Scorchio, prices for these should be around $450 to 500 if I go with direct drive, add $150 if I go with worm drive.
I have no plans to ever make parts to sell. I've made a few things for folks on this board for trade purposes, but I don't have time for that anymore, which is why it's taken me 2 years to get this far.
They are actual worm gears, so they wouldn't work with a spur gear. Worm drive helps smooth out the movements, and is essential for a lot of things in my opinion. The gears were basically free, I almost threw them away without realizing: viewtopic.php?f=24&t=3133
Hi Andrew. I'm from Brazil. Great work! Do you think of selling Monorail Dolly Zoom? I am interested in buying one. Congratulations and success!
Sat May 14, 2011 6:43 pm
photographicfireman
Joined: Thu May 12, 2011 10:05 am Posts: 25
Re: Monorail Dolly Zoom
makes me dizzy watching those videos haha, that's awesome!! great work!
Tue May 17, 2011 5:53 pm
sciencelookers
Joined: Wed Nov 11, 2009 10:45 am Posts: 1685 Location: Merritt Island, Florida, Estates Unitas
Re: Monorail Dolly Zoom
Literanema, These lens movers can do the zoom. They are plug and play compatable with the Dynamic Perception MX-2 dolly engine. Get the dolly from Dynamic Perception and the dolly controller has a second motor plug that you can use for the lens mover.
These lens movers are rail mounted so you can adjust the position onthe lens barrel where they engage the lens gear so they can be used on different lenses instead of being built around one specific lens.
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Thu May 19, 2011 6:45 am
BullishB
Joined: Sat Dec 10, 2011 9:58 pm Posts: 82 Location: South Australia
Re: Monorail Dolly Zoom
sciencelookers wrote:
Literanema, These lens movers can do the zoom. They are plug and play compatable with the Dynamic Perception MX-2 dolly engine. Get the dolly from Dynamic Perception and the dolly controller has a second motor plug that you can use for the lens mover.
These lens movers are rail mounted so you can adjust the position onthe lens barrel where they engage the lens gear so they can be used on different lenses instead of being built around one specific lens.
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